Joke Collection Website - Public benefit messages - Is the text message at this number sent by Unicom?

Is the text message at this number sent by Unicom?

Usually, the port of our external unified customer service hotline is 100 10. If you receive short messages from other ports, it is recommended not to believe them. 10-6557899 may be the port where local Unicom sends promotional messages. It is recommended that you contact the customer service of Unicom in your place of origin for verification, which is subject to the Unicom policy in your place of origin.